Separating the infrared driving laser from the extreme ultraviolet (XUV) pulses after high-order harmonic generation has been a long-standing difficulty. In this Letter, we propose and demonstrate that the driving laser can be blocked by simply installing a microchannel plate (MCP) into the beam line. In addition to its high damage threshold, the MCP filter also transmits photons over the entire XUV region. This paves the way for attosecond pulse generation with unprecedented bandwidth.
© 2014 Optical Society of America
Original Manuscript: February 7, 2014
Revised Manuscript: May 14, 2014
Manuscript Accepted: May 14, 2014
Published: June 13, 2014
Qi Zhang, Kun Zhao, Jie Li, Michael Chini, Yan Cheng, Yi Wu, Eric Cunningham, and Zenghu Chang, "Suppression of driving laser in high harmonic generation with a microchannel plate," Opt. Lett. 39, 3670-3673 (2014)